Stamped recommendations

Last October, Yahoo acquired Stamped, the first acquisition of the Mayer regime. The recommendation engine built by former Googlers launched as a smartphone app in November 2011, letting users recommend books, movies, restaurants, and other things to friends.

Alike recommendations

In February, Yahoo made another mobile move when it acquired Propeld, maker of the Alike location-based app which let users recommend bars, restaurants, and shops that are considered favorites and are nearby or similar to other venues.

$1.1 billion for Tumblr

Promising "not to screw it up," the companies said Tumblr would remain a separate entity with the same "irreverence, wit, and commitment to empower creators." Founder David Karp stayed on in his role as CEO of Tumblr.

Pinterest clone Snip.it

Snip.it helped people collect and share content they are interested in, including articles, images, and videos. The Pinterest-like service catered to subject-matter experts who wanted to add their own commentary to digital content. Yahoo shuttered the company after acquiring it in January.

Jybe social recommendations

In March, Yahoo announced the acquisition of Jybe, an iOS app that recommended books, movies, and restaurants based on user preferences stated on social-networking sites. As part of the acquisition, the Jybe service and app were shut down.

MileWise

In May, Yahoo bought travel startup MileWise, which promised to help you "Travel like a genius." The service enabled users to figure out travel rewards programs, searching for flights in frequent flyer miles and hotels in credit card points. It has since been shut down.

Loki Studios mobile gaming

With an emphasis on talent acquisition, in May, Yahoo aquired Loki Studios, a mobile gaming startup. In a tweet announcing the purchases of Astrid, GoPollGo, MileWise, and Loki Studios, Yahoo specifically mentioned the engineers and entrepreneurs behind the startups, highlighting their talent purchasing, also known as "acqui-hiring."

Where to next?

Where will Mayer take Yahoo next? Given the breathless pace of acquisitions in the past year, the company has brought on board a lot of new talent. Now the question is whether the payoff will justify the price in Year 2 -- and beyond.